My girlfriend bought a Acer aspire 5315 series laptop last year August and the adapter suddenly stop working. it was working just fine last night and a few hour after, nothing. I've been noticing that the wire is starting to get a spiral twist but i don't think thats the problem. When it plugged into a outlet the light on the adapter it self comes on but no power is reaching the laptop itself. I cut the tip that connects top the laptop to see if the wire broke but its fine. What could be the problem here?